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refactor: apply code review improvements

- add SQLite connection pool config and busy_timeout pragma
- add RWMutex for proper read/write locking in SQLite store
- add WaitGroup for safe cleaner goroutine shutdown
- fix XSS vulnerability with escapeHtml in show-message template
- rename keyKey constant to pathKeyParam for clarity
- convert hasControlChars to method on MessageProc
- remove dead getContentType() function from crypto.js
- simplify getValidatedHost() by removing redundant domain check
- update docker-compose.yml for SQLite configuration
- add Close() to Engine interface for proper resource cleanup
- add paranoid mode architecture documentation to CLAUDE.md
- move completed plan file to docs/plans/completed/
- fix flaky timing tests using require.Eventually
- fix test state mutation in loadMessageCtrl tests